LibGUI: Exit ColorPicker (successfully) when double-clicking a color

It feels natural that if I double click a color button, the dialog
closes successfully and "returns" that color.

Libraries/LibGUI/ColorPicker.cpp

@@ -50,11 +50,13 @@ class ColorButton : public AbstractButton {
 
 protected:
  virtual void click() override;
+ virtual void doubleclick_event(GUI::MouseEvent&) override;
  virtual void paint_event(PaintEvent&) override;
 
 private:
- explicit ColorButton(Color color = {});
+ explicit ColorButton(ColorPicker& picker, Color color = {});
 
+ ColorPicker& m_picker;
  Color m_color;
  bool m_selected { false };
 };
@@ -310,7 +312,7 @@ void ColorPicker::create_color_button(Widget& container, unsigned rgb)
 {
  Color color = Color::from_rgb(rgb);
 
- auto& widget = container.add<ColorButton>(color);
+ auto& widget = container.add<ColorButton>(*this, color);
  widget.set_size_policy(SizePolicy::Fill, SizePolicy::Fill);
  widget.on_click = [this](Color color) {
  for (auto& value : m_color_widgets) {
@@ -328,10 +330,10 @@ void ColorPicker::create_color_button(Widget& container, unsigned rgb)
  m_color_widgets.append(&widget);
 }
 
-ColorButton::ColorButton(Color color)
+ColorButton::ColorButton(ColorPicker& picker, Color color)
+ : m_picker(picker)
 {
  m_color = color;
- m_selected = false;
 }
 
 ColorButton::~ColorButton()
@@ -343,6 +345,13 @@ void ColorButton::set_selected(bool selected)
  m_selected = selected;
 }
 
+void ColorButton::doubleclick_event(GUI::MouseEvent&)
+{
+ click();
+ m_selected = true;
+ m_picker.done(Dialog::ExecOK);
+}
+
 void ColorButton::paint_event(PaintEvent& event)
 {
  Painter painter(*this);